Allen-Bradley 1336-PB-SP2B (74101-502-51) Precharge PC Board | Replacement, Equivalent & Selection Guide
The Allen-Bradley 1336-PB-SP2B (also referenced as 74101-502-51) is an OEM Precharge PC Board designed for the Rockwell Automation 1336 PLUS / 1336 PLUS II series AC variable frequency drives. This board manages the DC bus precharge sequence, protecting the drive’s power components from inrush current during power-up. Sourced directly through authorized and verified industrial supply channels, this part is available at Konmask.com with global shipping support.
Technical Specifications
- Part Number: 1336-PB-SP2B
- Reference / Board Number: 74101-502-51
- Manufacturer: Allen-Bradley / Rockwell Automation
- Function: DC Bus Precharge Control PC Board
- Compatible Drive Series: 1336 PLUS, 1336 PLUS II AC Drives
- Board Type: Precharge / Soft-Start Control PCB
- Weight: Approx. 300 g
- Condition: New / Surplus / Refurbished (specify at order)
- Warranty: 12 months from shipment date
Compatible Replacement & Equivalent Models
When the original 1336-PB-SP2B is unavailable or discontinued, the following alternatives may be considered depending on your drive revision and firmware version. Always verify hardware revision compatibility before substitution.
- 1336-PB-SP2B — OEM original (this listing)
- 1336-PB-SP2 — Earlier revision; functionally equivalent in most 1336 PLUS applications; confirm board revision with drive nameplate
- 74101-502-51 — Internal Rockwell board reference number for the same assembly
- 1336-PB-SP3B / SP4B — Later revisions for 1336 PLUS II; check drive firmware and power rating before cross-referencing
- Third-party compatible boards — Available for select frame sizes; must match connector layout, precharge relay rating, and bus voltage range. Contact us for compatibility verification.
Note: Konmask.com recommends using OEM parts wherever possible. Equivalent substitutions should be validated by a qualified drive technician.
Why Choose the Original Model
- Guaranteed Compatibility: Designed and tested specifically for the 1336 PLUS / PLUS II drive platform — no firmware or connector adaptation required.
- Inrush Protection Integrity: OEM precharge timing and relay ratings are calibrated to Rockwell’s bus capacitor specifications, ensuring safe power-up sequences.
- Reduced Commissioning Risk: Drop-in replacement eliminates integration uncertainty common with third-party boards.
- Traceability: Full OEM part traceability for ISO-compliant maintenance records and audit trails.
- Long-Term Support: Rockwell Automation service documentation and firmware updates reference OEM part numbers directly.
Typical Applications
- AC variable frequency drive (VFD) repair and maintenance in manufacturing plants
- Pump and fan drive systems in water treatment and HVAC facilities
- Conveyor and material handling drive refurbishment
- Compressor and blower control systems in oil & gas and chemical processing
- Preventive maintenance stock for facilities running 1336 PLUS / PLUS II drive fleets
- OEM machine builders requiring certified spare parts for after-sales service
System Compatibility
- Drive Family: Allen-Bradley 1336 PLUS (Series A, B, C) and 1336 PLUS II
- Power Range: Verify against specific drive frame size (0.37 kW – 448 kW range across the 1336 family)
- Input Voltage: 200–240 V AC, 380–480 V AC, 500–600 V AC (drive-dependent)
- Control Platform: Compatible with RSLogix 5, RSLogix 500, and legacy PLC-5 / SLC 500 control architectures
- Communication: Works within existing DeviceNet, DH+, and Remote I/O drive configurations
Always cross-reference the drive’s catalog number and series letter on the nameplate before ordering.
Selection Guide
Use the following decision flow to select the correct precharge board for your 1336 drive:
- Step 1 — Identify drive catalog number: Locate the full catalog number on the drive nameplate (e.g., 1336F-BRF30-AN-EN).
- Step 2 — Confirm series revision: Series A/B → typically SP2 or SP2B; Series C / PLUS II → may require SP3B or SP4B.
- Step 3 — Check board reference number: Remove the existing board and verify the silkscreen or label reference (74101-502-51 confirms SP2B).
- Step 4 — Verify power rating: Ensure the replacement board’s relay and resistor ratings match the drive’s DC bus voltage and capacitor bank size.
- Step 5 — Contact Konmask if uncertain: Send us your drive nameplate photo and we will confirm the correct part number before you order.
Quality Assurance & Sourcing
- Source: Procured from authorized distributors, OEM surplus channels, and certified refurbishers.
- Inspection: Each board undergoes visual inspection, component-level verification, and functional bench testing where applicable.
- Packaging: Anti-static ESD packaging with foam cushioning for safe international transit.
- Documentation: Certificate of conformance and test report available upon request.
- Counterfeit Prevention: All parts are sourced through traceable supply chains. We do not source from unverified grey-market channels.
How to Order
- Online: Add to cart directly on this page. Specify required condition (New / Surplus / Refurbished) in the order notes.
- Email: support@konmask.com — include your drive catalog number and required quantity.
- Phone / WhatsApp: +0086 19859288691
- Lead Time: In-stock items ship within 1–3 business days. Ex-stock sourcing typically 5–10 business days.
- Shipping: DHL / FedEx / UPS express worldwide. Sea freight available for bulk orders.
- Payment: T/T (wire transfer), PayPal, credit card, and trade assurance accepted.
Replacement & Compatibility FAQ
Q: Can I use a 1336-PB-SP2 instead of the SP2B?
A: In most cases yes — the SP2B is a revised version of the SP2 with minor component updates. However, always verify the board revision matches your drive’s service manual requirements.
Q: Is this board compatible with the 1336 IMPACT or 1336 FORCE drives?
A: No. The 1336-PB-SP2B is specific to the 1336 PLUS / PLUS II platform. The IMPACT and FORCE series use different precharge architectures.
Q: What causes precharge board failure in 1336 drives?
A: Common causes include precharge relay contact wear, resistor thermal stress from frequent power cycling, and DC bus overvoltage events. Replacing the board as part of a scheduled maintenance interval is recommended.
Q: Do you offer exchange / core return programs?
A: Yes. Contact us for details on our exchange pricing for refurbished units with core return credit.
Q: Can Konmask verify compatibility before I order?
A: Absolutely. Send your drive nameplate details or full catalog number to support@konmask.com and our technical team will confirm the correct part.
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Contact: support@konmask.com | +0086 19859288691
